If your computer's running a little loud for your tastes, it's probably because your fans are running at full speed-even if they don't need to be. Here's what i did, but the problem is still not resolved yet: - Reset PRAM. ’ Select the fan of which you want to change the speed. While they won’t provide the same level of comfort as air conditioning (A/C) does, fans have a lot of perks that the A/C can’t offer.